When you change the default settings, this mean that when you will create a new entry, the display would be set to external as example instead of embedded. This will not update your current sessions. This will only apply the default settings on new entry.

To update several sessions at the same time, to set them to external as example, we would need the help of the Custom PowerShell command feature, however, I am not able to apply the requested changes on my side, so I will have a look at this tomorrow morning with our engineering department and get back to you, like I mentioned in the email that I just sent you via our support mailbox for the second case that you had opened via this other channel.